All-semiconductor regulated HT PSU

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If I had been successful in my search for a fairly simple all-transistorised HV PSU, then I would have copied it. But I wasn't, so with my limited experience and capacity for analogue cct. design, I slowly derived the cct. as shown. However, I am interested in your suggestions for an improved version. Perhaps you'd care to design and assemble such a cct., starting with my design, incorporate your ideas, and then present the finished product here? The mechanical construction of my finished product enables maintenance and modifications to be easily implemented.

Al. / Aug. 3, '14 //